persistence

问题 This question already has answers here : NHibernate.MappingException: No persister for: XYZ (15 answers) Closed 5 years ago . Well, I googled a lot, and found the same advices all there (set hbm as Embedded Resource, add hbm at hibernate.cfg, etc..), and despite of them, I still not get it. Let me explain: I wrote a Communication Dll for a ticket gate device, and there I have a configuration model class, that I use to configure that device through TCP/IP. But now, I have to persist this

问题 How to insert data in symfony2 doctrine2 on native sql? My query insert into propriedades (id,name,descripcion,num_lote,cod_imovel,imovel,convenio,proprietar,cpf,area_ha,perimetro,location,centro) VALUES (nextval('propriedades_id_seq'),'?','?','?','?','?','?','?','?','?','?',ST_GeomFromKML('<Polygon><outerBoundaryIs><LinearRing><coordinates>".$terra['coordinates']."</coordinates></LinearRing></outerBoundaryIs></Polygon>'),ST_Centroid(ST_GeomFromKML('<Polygon><outerBoundaryIs><LinearRing>

问题 How to insert data in symfony2 doctrine2 on native sql? My query insert into propriedades (id,name,descripcion,num_lote,cod_imovel,imovel,convenio,proprietar,cpf,area_ha,perimetro,location,centro) VALUES (nextval('propriedades_id_seq'),'?','?','?','?','?','?','?','?','?','?',ST_GeomFromKML('<Polygon><outerBoundaryIs><LinearRing><coordinates>".$terra['coordinates']."</coordinates></LinearRing></outerBoundaryIs></Polygon>'),ST_Centroid(ST_GeomFromKML('<Polygon><outerBoundaryIs><LinearRing>

问题 Can someone help me write the dependency for javax.persistence . I have googled it but nothing worked. I bumped into this page that gives some details on how to write the dependency, but yet i am unable to write it. Can someone help me out? 回答1: This is the one for javax.persistence : <dependency> <groupId>javax.persistence</groupId> <artifactId>persistence-api</artifactId> <version>1.0.2</version> <scope>provided</scope> </dependency> and this is for the whole Java EE 6 stack: <dependency>

问题 Closed . This question is opinion-based. It is not currently accepting answers. Want to improve this question? Update the question so it can be answered with facts and citations by editing this post. Closed 6 years ago . I want to use the Java Persistence API (JPA) for my web application. There are popular JPA implementations like Hibernate , Toplink and EclipseLink . What implementation is a good choise and why? 回答1: When the Java Persistence API (API) was developed, it became popular very

问题 Simply put I have a many to one relation on the Child class with the Parent class. I want to load all the children without having to load their parent details. My child class is @Entity public class Child implements Serializable { @Id @GeneratedValue(strategy = GenerationType.IDENTITY) private Long id; private String name; @ManyToOne(fetch = FetchType.LAZY) @JoinColumn(name = "parentId", referencedColumnName = "id") private Parent parent; public Child() { } // Getters and setters here } My

问题 How do we specify LockMode in EJB3 Persistence NamedQuery? I want to add Pessimistic LockMode to my existing select so that I can update if necessary but surprisingly Query object doesnot have setLockMode(xxx) method ( My understanding was if JPA, asubset of EJB3 persistence, exposes setLockMode, EJB3 persistence should have the method available too). Query query = em.createNamedQuery("findOptoutStudent"); query.setParameter("optoutIndicator", optoutIndicator); List<Student> students = query

问题 I have a legacy java project where I have more than 1000 table and a lot of SQL queries. In order to achieve a better querying performance I m studying the apache ignite in memory database where I wan't to use the 3rd party persistence mechanism, the later is based on caching (CacheStore) that I implemented successfully in my POC, unfortunately I have lot of complex queries with lot of joins, in this case I have to update my queries using cache store names as in the example private static

问题 As a system analyst, I develop a class object mapping the columns of tables , so that I can call stored procedures to return a list of class objects as json array. Throughout examining the SQL structure of the table, there is a composite key made of LOOKUP_CODE and LOOKUP_TYPE. The sql database is Oracle 9i Result : Some fields are missing to be returned Would you please devise the strategies to match the columns under this case? Here is my table columns : Here is the SQL: CREATE TABLE "PC

问题 I made an android game and I want to know how to save player data such as money, level reached, etc. I think that XML is not a really convenient way to do this. Is there any good way to do this? Does android provide some method to save the data? 回答1: A database is probably overkill for the type of data you need to track. I would suggest using Android's SharedPreferences APIs. See here for a tutorial. Here's an official overview of Android data persistence methods including SharedPreferences